1 /* $Id: encavcodec.c,v 1.23 2005/10/13 23:47:06 titer Exp $
3 This file is part of the HandBrake source code.
4 Homepage: <http://handbrake.fr/>.
5 It may be used under the terms of the GNU General Public License. */
9 #include "libavcodec/avcodec.h"
11 struct hb_work_private_s
14 AVCodecContext * context;
18 int encavcodecInit( hb_work_object_t *, hb_job_t * );
19 int encavcodecWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
20 void encavcodecClose( hb_work_object_t * );
22 hb_work_object_t hb_encavcodec =
25 "MPEG-4 encoder (libavcodec)",
31 int encavcodecInit( hb_work_object_t * w, hb_job_t * job )
34 AVCodecContext * context;
36 hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
41 codec = avcodec_find_encoder( CODEC_ID_MPEG4 );
44 hb_log( "hb_work_encavcodec_init: avcodec_find_encoder "
47 context = avcodec_alloc_context();
48 if( job->vquality < 0.0 )
51 context->bit_rate = 1000 * job->vbitrate;
52 context->bit_rate_tolerance = 10 * context->bit_rate;
56 /* Constant quantizer */
57 // These settings produce better image quality than
58 // what was previously used
59 context->flags |= CODEC_FLAG_QSCALE;
60 if (job->vquality < 1.0)
63 vquality = 31 - job->vquality * 31;
64 // A value of 0 has undefined behavior
65 // and ffmpeg qp has integral increments
68 context->global_quality = FF_QP2LAMBDA * vquality + 0.5;
72 context->global_quality = FF_QP2LAMBDA * job->vquality + 0.5;
74 context->mb_decision = 1;
75 hb_log( "encavcodec: encoding at constant quantizer %d",
76 context->global_quality );
78 context->width = job->width;
79 context->height = job->height;
80 context->time_base = (AVRational) { job->vrate_base, job->vrate };
81 context->gop_size = 10 * job->vrate / job->vrate_base;
82 context->pix_fmt = PIX_FMT_YUV420P;
84 if( job->pixel_ratio )
86 context->sample_aspect_ratio.num = job->pixel_aspect_width;
87 context->sample_aspect_ratio.den = job->pixel_aspect_height;
89 hb_log( "encavcodec: encoding with stored aspect %d/%d",
90 job->pixel_aspect_width, job->pixel_aspect_height );
93 if( job->mux & ( HB_MUX_MP4 | HB_MUX_PSP ) )
95 context->flags |= CODEC_FLAG_GLOBAL_HEADER;
97 if( job->mux & HB_MUX_PSP )
99 context->flags |= CODEC_FLAG_BITEXACT;
103 context->flags |= CODEC_FLAG_GRAY;
106 if( job->pass != 0 && job->pass != -1 )
108 char filename[1024]; memset( filename, 0, 1024 );
109 hb_get_tempory_filename( job->h, filename, "ffmpeg.log" );
113 pv->file = fopen( filename, "wb" );
114 context->flags |= CODEC_FLAG_PASS1;
121 pv->file = fopen( filename, "rb" );
122 fseek( pv->file, 0, SEEK_END );
123 size = ftell( pv->file );
124 fseek( pv->file, 0, SEEK_SET );
125 log = malloc( size + 1 );
127 fread( log, size, 1, pv->file );
131 context->flags |= CODEC_FLAG_PASS2;
132 context->stats_in = log;
136 if( avcodec_open( context, codec ) )
138 hb_log( "hb_work_encavcodec_init: avcodec_open failed" );
140 pv->context = context;
142 if( ( job->mux & ( HB_MUX_MP4 | HB_MUX_PSP ) ) && job->pass != 1 )
146 w->config->mpeg4.length = 15;
147 memcpy( w->config->mpeg4.bytes, context->extradata + 15, 15 );
149 w->config->mpeg4.length = context->extradata_size;
150 memcpy( w->config->mpeg4.bytes, context->extradata,
151 context->extradata_size );
158 /***********************************************************************
160 ***********************************************************************
162 **********************************************************************/
163 void encavcodecClose( hb_work_object_t * w )
165 hb_work_private_t * pv = w->private_data;
169 hb_log( "encavcodec: closing libavcodec" );
170 avcodec_flush_buffers( pv->context );
171 avcodec_close( pv->context );
178 w->private_data = NULL;
181 /***********************************************************************
183 ***********************************************************************
185 **********************************************************************/
186 int encavcodecWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
187 hb_buffer_t ** buf_out )
189 hb_work_private_t * pv = w->private_data;
190 hb_job_t * job = pv->job;
192 hb_buffer_t * in = *buf_in, * buf;
200 frame = avcodec_alloc_frame();
201 frame->data[0] = in->data;
202 frame->data[1] = frame->data[0] + job->width * job->height;
203 frame->data[2] = frame->data[1] + job->width * job->height / 4;
204 frame->linesize[0] = job->width;
205 frame->linesize[1] = job->width / 2;
206 frame->linesize[2] = job->width / 2;
207 // For constant quality, setting the quality in AVCodecContext
208 // doesn't do the trick. It must be set in the AVFrame.
209 frame->quality = pv->context->global_quality;
211 /* Should be way too large */
212 buf = hb_buffer_init( 3 * job->width * job->height / 2 );
213 buf->size = avcodec_encode_video( pv->context, buf->data, buf->alloc,
215 buf->start = in->start;
216 buf->stop = in->stop;
217 buf->frametype = pv->context->coded_frame->key_frame ? HB_FRAME_KEY : HB_FRAME_REF;
224 fprintf( pv->file, "%s", pv->context->stats_out );